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Area and the distributive property is a free educational video by Khan Academy.It helps students in grades 3 practice the following standards 4.MD.A.3.
1. 4.MD.A.3 : Apply the area and perimeter formulas for rectangles in real world and mathematical problems. For example, find the width of a rectangular room given the area of the flooring and the length, by viewing the area formula as a multiplication equation with an unknown factor..